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    <meta charset = "UTF-8">
    <meta name = "viewport" content = "width = device-width",initial-scale = 1.0>
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>A Simple Calculator</title>
    <link rel = "stylesheet" href = "style.css">
    <script  type="text/javascript" src = "Calculator.js"> </script>
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<body>
    
    <div class = "frame">
    <div class = "title"> A Simple Calculator</div>
    <br/>
    <div class = "op" >
    <input/><br/>
    <div class= "button">7</div>
    <div class= "button">8</div>
    <div class= "button">9</div>
    <div class= "button1 button">/</div>
    <div class= "button">4</div>
    <div class= "button">5</div>
    <div class= "button">6</div>
    <div class= "button1 button ">*</div>
    <div class= "button">1</div>
    <div class= "button">2</div>
    <div class= "button">3</div>
    <div class= "button1 button">-</div>
    <div class= "button">0</div>
    <div class= "button">.</div>
    <div class= "button button2">⬅</div>
    <div class= "button1 button">+</div>
    <div class= "button button2">(</div>
    <div class= "button button2">)</div>
    <div class= "button button2">CE</div>
    <div class= "button1 button">=</div>
    <div class= "tips">计算器默认保存上一次的计算结果，如在接下来的运算中不需要使用到上次的运算结果，按CE即可</div>
    </div>
    </div>
    
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